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  1. #1
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    Default Mxz800 running hot

    Very new to snowmobiles. I have an 02 mxz800. Runs hot quickly. I found a hole in the carb flange on the pto side. Sucking air. I did order new ones. I the meantime, I have also torn apart many other things. This is the only problem I've found. Do you think this could be the culprit?

    Sent from my LGLS770 using Tapatalk

  2. #2
    Moderator racerxxx's Avatar
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    Well, sucking air is not good. That will lean out and potentially seize that cylinder. So, get that corrected. Also, you could check the thermostat to make sure it's working. You can check it in a pot of boiling water. The cooling is the heat exchangers, the snow gets thrown on them and that helps cool the antifreeze. If you don't have much snow on them you can run hotter. Also, compare the plugs between the pto and mag cylinder.

    Sent from my SGH-T889 using Tapatalk

  3. #3
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    Thermostat works, it started opening around 110 degrees. I ordered a new one anyway. Plugs look good. Pistons look good. Pump working good. Tomorrow, I plan on checking them temp sensor. Only has idiot light (no guage). I am assuming it is a normal open/closed switch. Maybe just bad sensor?? At any rate, I have a few days before new flanges arrive.

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  4. #4
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    Btw, thermostat opening at 110 seemed early to me. However, its marked 42c (107f). New one is same.

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  5. #5
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    Installing temp guage.

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  6. #6
    Moderator racerxxx's Avatar
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    I was gonna suggest that so you could get an accurate reading. An autometer gauge would probably work, and look cool all mounted up.

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  7. #7
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    That's what I did. It appears the wiring is there for it, too. I just unplugged the idiot light and replaced the sensor. Hopefully, the new flanges show up today. Expecting a decent snow fall tonight and tomorrow. Down to mud and grass eighty now.

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  8. #8
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    Hmm, not eighty now. I meant, right now.

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  9. #9
    Moderator racerxxx's Avatar
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    Cool. At least you have snow. We're supposed to get flurries on Wednesday. Just went snowboarding for the first time this season on Thursday night, that was opening day! This weather sucks.

    Sent from my SGH-T889 using Tapatalk

  10. #10
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    Ok, well I learned something else. Apparently, snowmobiles run ac voltage. So, my new gauge doesn't work. I suppose I will either have to install a battery for just the gauge or some sort of rectifier. Thoughts?

    Sent from my LGLS770 using Tapatalk

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